Good work :-)
I've actually got the synth in again for some other issues, so may try a
new socket while I've got it.
Will let you know if it does the job.
B
On Wednesday, August 21, 2013, Patrick Belcher wrote:
> ∗∗
>
>
> Hi Bob,
>
> I got this sorted in the end by putting new sockets for the filter chips in
> and re-flowing all joints. Before, I was losing amplitude at either end of
> the cutoff freq across all the voices, now it's all as described in the
> resonance calibration section.
>
> Most of the chips were stiff in their sockets, so I don't know if this was
> a combination of electrolysis and dry joints or not? I've still got one
> voice that takes a little longer to warm up than the others and suspect
> it's a related issue.
>
> Patrick
>
> On Wed, Jul 31, 2013 at 4:11 PM, Bob Stewart <bob@blzproductions.com<javascript:_e({}, 'cvml', 'bob%40blzproductions.com');>>
> wrote:
>
> > No, no other issues.
> >
> > I swapped the filter caps with another channel to if the issue would move
> > with the caps, but the issue remained where it was. Short of stripping
> the
> > board, ultrasonicaly cleaning board and rebuilding with new sockets, I
> was
> > kind of at a dead end.
> >
> > Interested to see if you turn up anything
> >
> > Cheers
> >
> > B
> >
> > On Wednesday, July 31, 2013, murger wrote:
> >
> > > ∗∗
> > >
> > >
> > > Thanks for that Bob. That all sounds pretty frustrating. Mine is
> working
> > > after a 20 min warm up period or so and I've ruled out the ssm as well.
> > >
> > > Based on your experience I'll start by sticking a new turnpin socket
> in,
> > > reflow everything and perhaps give it a clean as well then take some
> > > freezer spray to the circuit. Will let you know how I get on. Did you
> > > change all the ceramics (these can breakdown) and mylars around the
> > filter
> > > chip then?
> > >
> > > And have you had any other associated issues with that voice? I have a
> > > different voice which is pretty much a semitone flat of all the others,
> > > that also takes around 20 mins or so to settle.
> > >
> > > Pat
> > >
> > > --- In PolySix@yahoogroups.com <javascript:_e({}, 'cvml',
> 'PolySix%40yahoogroups.com');> <javascript:_e({}, 'cvml',
> > > 'PolySix%40yahoogroups.com');>, Bob Stewart <bob@...> wrote:
> > > >
> > > > Hi Pat.
> > > >
> > > > No didn't get to the bottom of it, but it wasn't any of the
> > following...
> > > >
> > > > Filter chip, electrolytics, filter caps, control inputs
> (multiplexers),
> > > VCA
> > > > transistors (just incas it was a loading issue).
> > > > The only thing I did that seemed to make difference was to clean the
> > > board
> > > > with isopropyl. The effect of doing this was that once the Polysix
> > > > has warmed up.... The problem disappears.
> > > > I can only think that the issue is related to either spillage, or
> > > > electrolyte on the board in that area.
> > > >
> > > > If you have any joy, please let me know.
> > > >
> > > > Cheers
> > > >
> > > >
> > > > B
> > > >
> > > > On Wednesday, July 31, 2013, murger wrote:
> > > >
> > > > > ∗∗
> > > > >
> > > > >
> > > > > Hi Bob,
> > > > >
> > > > > Any luck with this one? Got the same issue. Looking at the 560p
> > between
> > > > > pin 4 and 5 of the ssm.
> > > > >
> > > > > Pat
> > > > >
> > > > > --- In PolySix@yahoogroups.com <javascript:_e({}, 'cvml',
> 'PolySix%40yahoogroups.com');> <javascript:_e({}, 'cvml',
> > > 'PolySix%40yahoogroups.com');> <javascript:_e({}, 'cvml',
> > > > > 'PolySix%40yahoogroups.com');>, Robert Stewart <bob@> wrote:
> > > > > >
> > > > > > First thing I did.
> > > > > > Problem is not the SSM2044
> > > > > >
> > > > > > :-s
> > > > > > On 10/07/2013 14:53, alesisfusion8hd wrote:
> > > > > > >
> > > > > > > Have you swap SSM2044 with another voice to make sure the issue
> > > > > > > follows the filter? Never serviced a Polysix though, but I had
> a
> > > > > > > similar behavior on my Trident MkII. The SSM2044 was faulty.
> > > > > > >
> > > > > > > HTH
> > > > > > > Fran�ois
> > > > > > >
> > > > > > > --- In PolySix@yahoogroups.com <javascript:_e({}, 'cvml',
> 'PolySix%40yahoogroups.com');> <javascript:_e({}, 'cvml',
> > > 'PolySix%40yahoogroups.com');> <javascript:_e({}, 'cvml',
> > > > > 'PolySix%40yahoogroups.com');> <mailto:PolySix%40yahoogroups.com<javascript:_e({}, 'cvml', 'PolySix%2540yahoogroups.com');>
> <javascript:_e({},
> > 'cvml', 'PolySix%2540yahoogroups.com');><javascript:_e({},
> > > 'cvml', 'PolySix%2540yahoogroups.com');>>,
> > > > >
> > > > > > > "blzproductions" <bob@> wrote:
> > > > > > > >
> > > > > > > > Hi
> > > > > > > >
> > > > > > > > Servicing a Polysix for a client, and have come up against a
> > > weird
> > > > > > > issue, which I can't fathom. Hoping someone out there has had a
> > > > > > > similar issue, and may be able to help...
> > > > > > > >
> > > > > > > > One voice has a faulty filter section in that the resonance
> can
> > > be
> > > > > > > adjusted as per the line up procedure, but then if you lower
> the
> > > cut
> > > > > > > off, the resonance decreases.
> > > > > > > >
> > > > > > > > I have ruled out the problem being the SSM2044, all signals
> > > coming
> > > > > > > into the chip (ie. cut off/resonance control etc.) look
> correct,
> > > and
> > > > > > > are comparable, and I'm pretty sure it's not the filter caps as
> > > > > > > they're not electrolytics or Tantalums.
> > > > > > > > Also the connections between the caps and the filter chip are
> > > all OK.
> > > > > > > >
> > > > > > > > If anyone has any ideas, please get it touch. It's beginning
> to
> > > > > > > drive me mad.
> > > > > > > >
> > > > > > > >
> > > > > > > > Bob
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > [Non-text portions of this message have been removed]
> > > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > > [Non-text portions of this message have been removed]
> > > >
> > >
> > >
> > >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
>
> [Non-text portions of this message have been removed]
>
>
>
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